All patients have blood tests for hemoglobin, total leucocyte and differential count, sedimention rate, C-reactive protein, total IgE and IgE screen for food allergies, and antiendomysial and antigliadin antibodies (IgG and IgA) and anti-tissue transglutaminase antibodies for celiac disease. Furthermore, urine analyses for protein, blood and and leucocytes, three stool specimen for occult blood and one stool specimen for quantification of calprotectin.